What is/are the function(s) of the World Meteorological Organization?

To facilitate worldwide co-operation in the establishment of networks of stations for the making of meteorological observations as well as hydrological or other geophysical observations.

To promote standardization of meteorological and related observations and ensure the uniform publication of observations and statistics.

To promote activities in operational hydrology and to further enhance co-operation between meteorological and the hydrological services.

All of the above